70221761 has 4 divisors (see below), whose sum is σ = 70272000. Its totient is φ = 70171524.

The previous prime is 70221743. The next prime is 70221779. The reversal of 70221761 is 16712207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (70221743) and next prime (70221779).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70221761 is a prime.

It is a super-2 number, since 2×70221761² = 9862191435882242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70221761.

It is not an unprimeable number, because it can be changed into a prime (70221721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22961 + ... + 25838.

It is an arithmetic number, because the mean of its divisors is an integer number (17568000).

Almost surely, 2^70221761 is an apocalyptic number.

It is an amenable number.

70221761 is a deficient number, since it is larger than the sum of its proper divisors (50239).

70221761 is a wasteful number, since it uses less digits than its factorization.

70221761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50238.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 70221761 is about 8379.8425402868. The cubic root of 70221761 is about 412.5632808947.

Adding to 70221761 its reverse (16712207), we get a palindrome (86933968).

The spelling of 70221761 in words is "seventy million, two hundred twenty-one thousand, seven hundred sixty-one".